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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13115a67f7a55844404ef34b6f1fc14d90215466877dec520462cf8175c7c3e4' 
  AND token = 'No3Cg83hogKkvM6ajwAcqTVaORjCBRvqMRTTnj2A1PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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