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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08382fe97ae2f50494d5aedf579c594f7de6bfeacf9c3f575e8463d699c6d947' 
  AND token = 'RG2+R9JFdU65AGSOVdbCGpCnPvdO2VPc2t3st064VU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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