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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f1851a888c229e578c84dd7d7da733c083fe36b0378de16b7bfd594b39fb6e' 
  AND token = 'Pqg5R2nsjn9bfIvy+Tr6rKLwsOtutgxc0lpv0N2BEQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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