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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca56bb5eb637b26560023868d7cc3d13d0fe85edc0f85f737fa166196959e741' 
  AND token = '8CrXV0TEtHB1TRErJRMJcXSz6D03lTdbaL1Y2iqv7A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00142

JSON explain

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