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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d11deae2a2ee4be01e45b65d5d1943d54e2ecdcbb07a3b392fc24e2607b412' 
  AND token = 'SbuJP53wpGiLIlgajwG903feZyrmj7TNCyZ6aDYVR1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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