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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea201a28ea1efc3311647d296403edbe150fc1a667fc53e7170c9ffc528648dd' 
  AND token = 'uN/RnVR4MHNVSPOWr1j6xUx26ozNCwVl+G/VMIZth3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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