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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08daddcdb8f8f290c5b18979b02b9a49df88a852b22c65e5abb44f29858c7b9f' 
  AND token = '/6KJgP9GuMUNz/aL7FRKxIDLRq912PbghmUVHurUpIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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