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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7c8fd1e86779e36612daf026eddc3e5ef13f76947cc901d16c9e50f32d832b' 
  AND token = 'EUG7ggBmU92yeA3rRdWITbFfCtZQV1dBWYRrcabv7H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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