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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc2b612f8fd65eeee52940699f149b207a8333a31c9d0e0190f4efa8e6838bd' 
  AND token = '2mEop441KiB9zTgylnmjHuRUfrKoenkFR7iutvcPddQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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