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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9148e53c5cd2b808f09ad1ae6438b4cfd374543c0926382526de3ee51638e0d' 
  AND token = 'IBiuk6CMKYS3G7Yu1l1BoSOqJ7f0Ygk9o+OdD4Bg/gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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