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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a01ac6de723a4de7d3de7fb59ad4f52048ebbc35cce7c2ae6c2ef1b4514bad' 
  AND token = 'tPZiV8AcR8pVrRRB8b1Ox7agEafxcKYEQ1L+KJSxbQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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