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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5428a89e68bd807e83815c0a2a2b976c0b8363e30294f081c4d800cb5725cde2' 
  AND token = 'HAcSBkEk/ODiAhlRhQI5K3Aqpne+ud/LrS5Dym2RIXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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