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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9e12335b41a9106adedaa6209d00f5cd7b5b5f09cc64e100be94c8e6172ee1' 
  AND token = 'oPj+O4NbM/7R6YLHblT3yhAuLdZXMGTfRDOtLVcSUhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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