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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee83df3fc547a166940a7a29c4b10628c55bad323107ef7ca2a03998ff9d2d3b' 
  AND token = 'OTrFFnAg7+Zg7E6M332j3IM86ojGZZBpYC3OkAAB5z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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