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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c446df95ba9dd05ea8e32702131ebe7d074a7627ab4115b9a97cd1f80120908' 
  AND token = 'X2SdKbBMQipNvrS1vbOpjl3YAC3X/F+iz594ibFxksw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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