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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8fdcaf043e2fb9a4e3fda82cbe74bda77afb6a936224d13fa130259656aaa0' 
  AND token = 'rfb4K0Ei1VUQFhIRLBPgGeJFL8TIkKX3Z3OS+gRRI90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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