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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed75e62a38267c81f0f145e12ae2188dc932b92d6b168d58752c67cb8745401e' 
  AND token = 'kGdJI7zeX+IA26vR6HKEgc1ZQjv/tRUWScWUND+S8WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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