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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fa755f021a8873316029d3cb6b4056d8820a78717c945f8e24cf8896498d4e' 
  AND token = 'kmYsTsmYqbIG5PPhr1jx0kxTcOsG6y5Ncbw/vJCo2Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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