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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950a02c6b49499ad5113c60f7c5888f70f8d34c36fe47a95dfb834d853cbbe03' 
  AND token = '1pJJs47cU/Usv2kEdp2aX75BJj/pdRPmNoDZsdGfKNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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