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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8ff6ed507ce1ccdbc4332bffd320e0b62a744b989eeb3de5b5e050f503e9a5' 
  AND token = 'YsIovyZusPq+IlavADBBja/E8pnvDslPqe3X0cmpNT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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