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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f702c04f05bd25d3b0ad7ee14462288a41a7029ad132803ace1ece31354f3e1f' 
  AND token = 'hqhd20I41R9P62GDdUH4zLWp2sq79BEhGOTZmFCiS5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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