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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cebbf65f2708c082f35a7afb1c94460c7dc603e1abd2525550fba00db920abe' 
  AND token = 'mNcSyCTjSu23wQh/Z9pQmTli/P3awC4M/c/JZaD0+/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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