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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb2781b2225aab384a5c82cd464cbdfea91aef9d61c50e54ae14b83712f183e' 
  AND token = 'cvyu2/Vmw79Tdy3/Ft39vfQISXb8RZKfR6+IhAuHTOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}