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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c97bfd7e20846f844445edc9d281c687f204902df3548a2148281c1999103d1' 
  AND token = '0mRo+SXN0TOJCnJqW6y0YXCNku1pIcf7iv5h4Iy4zgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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