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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fb60cd1fb528c47815f4b3be5f5b99468eb23063058cf17320a3577cf978f9' 
  AND token = 'mrmrO08wqhcr7/gowFR7f2Y74IN5pXU7+GaQVz7ua2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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