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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abc1f6e9f8e8ca24f6d72be829671b6fdbef7f6c789af19b8997b24d76060bf' 
  AND token = 'IgdcuHHFPEkFj2peUnfR/cocfpvs4KjSYnEzvkUZuIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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