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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655291aef5d314fdbc8fed8f6299650565fe82aa378a722c5464894e51321b76' 
  AND token = 'h1ZbLNjS3UY10x20GEUCf7rsBAKkTsADAxr/j8SW2CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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