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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364012f118c07b07d55468b6c4631e9d2cfbbab5e3a66461ea7be7763d569a62' 
  AND token = 'RJd5FVSt5n4FJWghJph67lplqTUWsGJrHo6bnkT3L84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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