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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e0e9120d90a5eef4f32d72d621e62b8d7bcd2fba1e68eee685a8beb97a6dab' 
  AND token = 'OP7icN39HEago7ItyQyVjk6icWNLK7x+oKpNOfsxdNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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