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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a699793eac758b46b6d325dc9be6de68629dbc58d107b7cd27c4f05e1557d5f8' 
  AND token = 'FNGffyNxC2I5q8lwOlwbAQ5nVUlRzvbrwrcfguFCD84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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