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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6c3db39ae495a011e19b56f0ba6f60cb6a7184bdca8f3a5099de463fe84e3d' 
  AND token = 'auhsJtv6mqVJNU5WEjwO0THR0SU6isQncwC1rK+i+0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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