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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d5c32df22537e9a5dd4a421780452ab2495c57fe858cd6aac72d7791af17f6' 
  AND token = 'Qy2Bp3N9agDZ5y2T2a/VoS7kxQ8rKXyg1KLvwgPjlV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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