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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '280444d205960d57dc50ed9edbabc669cd495e2cfe57da676cae10a6c075ccac' 
  AND token = 'jHYKfmpu/Vozk4ZgebSAGb13QjbQA2gSnadAr387zFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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