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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92ed9e0bf96714183c304af5c33ae4486b95fc64b26a348bb84462ef9eb7c06' 
  AND token = 'UmJCOsEiJpArMHjfs9nyANnwyIPgFoh+s2KxufKVjPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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