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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfa6a7fa7a091a29856ccadd19e2fdf908ee44986e69db1054045f5464951c4' 
  AND token = '9SkMHZgYkybnS2fZEAoBkAxl0zXHOTkjJAGifOQbF+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.02962

JSON explain

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