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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8164e89db178b7fc4398dbe25908fc782927ba1337976aa67fb06b30b2474192' 
  AND token = 'ANZ8irwp5m5e2Ge/RMd6E0UMKootO8z7HLkmd8hRL1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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