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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2777fc34b87fee9a2d729ad171febe61e84201d6f30775ec7cb29317d7a00ffd' 
  AND token = 'qjDw1QbTnw87+1LFzX/YHp2AEu70wwfXtQuJGCv7as0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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