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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2704fd926689c6a9168fb92b6d525b7afb0479ac14272c7ed989afa4bd2b2d5' 
  AND token = 'TC1N+ZuJyGJFMYeDbE3gui2CMAiS00UP5ZxVVVFEGMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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