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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c9caf900903c043fee78b2e8b62075274200fb21698409d7dfd6cefea2f106' 
  AND token = 'iI9ai1C1ugsI2gY8+K2IXtz9nGDjX+m5fDcICqT+IQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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