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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28a28a6a4927f1fbe8bfdf048dc84bac5f554c16640bc9a030846c2c7191dbf' 
  AND token = 'eMn1hDbvbWf7jUaE+Rv4f31TQ/RHX9yIBejxGDgS1N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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