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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57d23ed1ae6fdf6ac2b4b07e3f27432660e06d8b89f0eafba8a1d0f5b4b8159' 
  AND token = 'bdyMKjlr9K4ZQn7+Zm8zki1vL7Tp3Zj3aouQJar2QiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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