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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ccffc46e667bcfc36d5b9ccbb968eccbcb875b3dfb809eca91a5f3ce13de2bc' 
  AND token = 'OW3T3HwH/uWriCKsHGkzKE3uHimBb3jRIW6gMJv8Vng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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