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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1827fcc07ac36cc18748e7e4663b90c0b5cbebcd1b50e1f47410e453ce91b2' 
  AND token = '3YUrc6ModJEWdMA1R7b2XDtOl87cY/gkJ4AlUkvR394=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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