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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3cb2bea1e55f674df4b71edb2063e8bb2a0699b430a3a1baaf4f6d288c6f1d' 
  AND token = 'NFR1/qfqyBNhS7v74NgRGMLG6aKzZ0qOGR6R1us5uZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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