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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f941453ebc5057e149e30cd7cc908d048c9363f2add213f8b0512ce6814057da' 
  AND token = 'tga5U3huqbQtr629VpiHXNIzgNRsqdbOXmtvxyH7sZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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