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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27ee1388a0a2cf843ba1fe8c4ebca9830be1fed09c271735ebd114cd5a3f4e9' 
  AND token = 'Zdhktjp66kVbfBfUJpYOPA7iKa8TH3p/cLrE44Y3fAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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