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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281c106074078f458c865b6aae5b66a4ffa72378ffbb1607e973332a1bd594dc' 
  AND token = 'VBm2Amn89ObquR2JpNZ4mSsmdPneR/4r2iMXL+9z0Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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