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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f6a194cad5ec97ea28a1ceb9e3d46c0f4dde79019b6785430765cdbae2ca3d' 
  AND token = '06AdAIbbFsR4cS/uj0dtyw44b3ZCiwpevY+HJ1oNEvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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