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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2f566ba80902cecacc9846edee41c6bb83aa3a854069e3da02c1cafb308a0e' 
  AND token = 'Wc8d/9nnyndeZMGvCeA6qLpFY4xz/jFf7XpTNGk5+I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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