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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444b1e8aab5717b0c0aaf5f432d72c825a2049d0123e271b6d37c5f18c59051b' 
  AND token = 'J2sUWFklr3eZUCwqnzGEccOacKBktLs9M3LqGmpIhw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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