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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe055b79c7ca7e2d40dc820a86ad0bd832adde566e89f1a7e0669414032b0b6' 
  AND token = 'c67DtJLuFrY8xkHaxcF3XrBQPRmTnOm7+CGVQtsLsgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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